Chef and Walking on the rectangle

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Chef likes rectangles. Among all possible rectangles, he loves rectangles that can be drawn like a grid, such that they have N rows and M columns. Grids are common in Byteland. Hence, Chef has drawn such a rectangle and plans on moving around in it. The rows of the rectangle are labeled from 1 to N from top to bottom. The columns of the rectangle are labeled form 1 to M from left to right. Thus,

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solution.cppC++17

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